The nature of the KT impactor; a 54Cr reappraisal

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doi: 10.1016/j.epsl.2005.11.006
Authors:Trinquier, Anne; Birck, Jean-Louis; Allègre, Claude Jean
Author Affiliations:Primary:
Institute de Physique du Globe de Paris, Laboratoire de Géochimie et Cosmochimie, Paris, France
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 241(3-4), p.780-788. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:2006
Note:In English. Inst. Phys. Globe de Paris, Contrib. No. 2104. 56 refs.; illus., incl. 3 tables
Summary:According to the variations observed in the various meteorite classes, 54Cr represents an isotopic tool for planetary body discrimination. In the search for the nature of the Cretaceous-Tertiary (KT) impactor, Cr isotopic measurements were already performed at KT boundary. The current work is aimed to modernize Cr isotopic data with high-precision measurements to confirm a carbonaceous chondrite type infall, the contribution of which is also estimated. Isotopic signatures of two marine clays (Caravaca, Stevens Klint) exhibit an isotopic ratio which would represent a mixing of a carbonaceous chondrite of CM2 type with terrestrial material in a ratio 6% to 19%. A single impactor may account for both marine and continental Cr isotopic signatures. Abstract Copyright (2006) Elsevier, B.V.
Sections:Clay minerals; Geochemistry; Meteorites and tektites
Subjects:Carbonaceous chondrites; Cenozoic; Chondrites; Chromium; Cr-53/Cr-52; Cretaceous; Geochemistry; Impacts; Isotope ratios; Isotopes; Lower Paleocene; Mesozoic; Metals; Meteorites; Paleocene; Paleogene; Stable isotopes; Stony meteorites; Stratigraphic boundary; Tertiary; Upper Cretaceous; Caravaca Spain; Colorado; Denmark; Europe; Iberian Peninsula; Murcia Spain; New Mexico; Raton Basin; Scandinavia; Southern Europe; Spain; Stevns Klint; United States; Western Europe; Cr-54; Cr-54/Cr-52; K-T boundary
Coordinates:N380600 N380600 W0015100 W0015100
N551300 N552500 E0122500 E0120600
Abstract Numbers:06M/935
Record ID:2006087590
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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